﻿// 
// Radegast Metaverse Client
// Copyright (c) 2009-2013, Radegast Development Team
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the application "Radegast", nor the names of its
//       contributors may be used to endorse or promote products derived from
//       this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// $Id$
//

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace Radegast
{
    public class Keyboard : IMessageFilter
    {
        const int WM_KEYDOWN = 0x100;
        const int WM_KEYUP = 0x101;
        const int WM_SYSKEYDOWN = 0x104;
        const int WM_SYSKEYUP = 0x105;

        HashSet<Keys> mKeyStates = new HashSet<Keys>();

        public bool PreFilterMessage(ref Message m)
        {
            if (m.Msg == WM_KEYDOWN || m.Msg == WM_SYSKEYDOWN)
            {
                Keys key = (Keys)(int)m.WParam & Keys.KeyCode;
                mKeyStates.Add(key);
            }
            else if (m.Msg == WM_KEYUP || m.Msg == WM_SYSKEYUP)
            {
                Keys key = (Keys)(int)m.WParam & Keys.KeyCode;
                mKeyStates.Remove(key);
            }
            return false;
        }

        public bool IsKeyDown(Keys key)
        {
            return mKeyStates.Contains(key);
        }
    }
}